Question: What does
the hidden parameter _smu_debug_mode do? How do I use
_smu_debug_mode do debug a corrupted data file? Can
you show an example of using _smu_debug_mode?
Answer: The _smu_debug_mode is
used to set other parameter values and it should only be
used when working directly with Oracle technical support.
--If
you find an error like this one below,
ORA-30019:
Illegal rollback Segment operation in Automatic Undo mode
--then you
need to follow these steps:
commit;
alter
session set "_smu_debug_mode" = 4;
begin
dbms_transaction.purge_lost_db_entry('local_tran_id');
end;
/
--Or, if
you got this another error below
ORA-06510: PL/SQL: unhandled
user-defined exception
ORA-06512: at "sys.dbms_transaction",
line 94
ORA-06512: at line 1
--then you need to follow these
steps:
rollback force '7.12.102';
Commit;
alter
system set "_smu_debug_mode" = 4;
begin
dbms_transaction.purge_lost_db_entry('local_tran_id');
end;
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